68647940856 has 128 divisors (see below), whose sum is σ = 220260902400. Its totient is φ = 19578723840.

The previous prime is 68647940833. The next prime is 68647940903. The reversal of 68647940856 is 65804974686.

68647940856 is a `hidden beast` number, since 6 + 86 + 479 + 4 + 0 + 85 + 6 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 68647940793 and 68647940802.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 809380 + ... + 890163.

It is an arithmetic number, because the mean of its divisors is an integer number (1720788300).

Almost surely, 2^68647940856 is an apocalyptic number.

68647940856 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

68647940856 is an abundant number, since it is smaller than the sum of its proper divisors (151612961544).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

68647940856 is a wasteful number, since it uses less digits than its factorization.

68647940856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1699586 (or 1699576 counting only the distinct ones).

The product of its (nonzero) digits is 69672960, while the sum is 63.

The spelling of 68647940856 in words is "sixty-eight billion, six hundred forty-seven million, nine hundred forty thousand, eight hundred fifty-six".